选择性吸附氧化硫代硫酸盐催化剂的研究

Study on the catalyst for selective absorption and oxidation of thiosulfate

采用共沉淀法制备铜改性MgAl类水滑石(CLDH),并对制得的CLDH进行结构表征。结果表明,铜镁比(摩尔比)为0.1、450℃下焙烧4h时制得的CLDH层状结构相对维持的最好,BET表面积、孔容积和孔直径最大。类水滑石层状结构和高分散氧化铜是CLDH活性提高的主要原因。将制得的CLDH作为催化剂选择性吸附脱除模拟脱硫废液中的硫代硫酸根,CLDH用量为5g/L,反应温度为60℃,反应时间为6h时,硫代硫酸根脱除率为93.0%,而硫氰酸根的脱除率不足8%,CLDH再生3次后对硫代硫酸根仍然表现出良好的脱除效果和选择性。

Cu doped calcined layered double hydroxides（CLDH）was prepared by co-precipitation method,and the obtained CLDH was characterized by different methods.Results showed that when molar ratio of Cu to Mg was0.1,roasting 4hat 450℃,the CLDH kept the best layer structure and had the largest BET surface area,pore volume and pore diameter.The layered structure hydrotalcite and the high dispersed CuO were the major factors to the high activity of CLDH.The catalyst was proposed to selective removal of thiosulfate in simulate desulfurized waste solution.The sodium thiosulfate removal rate could reach 93.0%at 60℃ with CLDH dosage of 5g/L and 6hof reaction time.The thiocyanate removal rate was less than 8%.The CLDH still kept the high activity and selectivity after 3times regeneration.